People hold a portrait picture of Adama Traore as they attend a white march organised in tribute to the 24-year old man in Beaumont-sur-Oise on July 22, 2016. Violence erupted in the northern suburbs of Paris for a third night in a row on July 21, 2016, with 15 cars set ablaze by residents furious over the death of a young man in police custody. The unrest began on July 19 after it emerged that Adama Traore, 24, had died shortly after being arrested in the town of Beaumont-sur-Oise. Authorities said an autopsy revealed he was suffering from a serious infection at the time of his death and that his body showed few signs of violence. / AFP PHOTO / Thomas SAMSON